First things first you must love yourself accept your flaws and remove your insecurities because you are you and not them. It might be easy to say but it's hard to do but after loving yourself you can say it to yourself  'it is worth it' because loving yourself is the best option you can reward to yourself. 

Before loving and giving your all to other people love yourself first and if you will love someone else you must remember that you should not give your all to the that person instead you should leave a little bit for yourself because if that person hurt or left you, You are not completely broken cause you left a little love for your self.